Call to a member function query() on null

// connection variables
$servername = "localhost";
$username = "user";
$password = "wachtwoord";
$dbname = "harryare-8";

// crearte connection
$connect = new Mysqli($servername, $username, $password, $dbname);

// check connection
if($connect->connect_error) {
    die("Connection Failed : " . $connect->error);
} else {
     echo "Successfully Connected";
}

$sqlConfirm = "SELECT * FROM users WHERE usr_confirm_hash = $_GET[id]";
echo $sqlConfirm.'<br />';
$rs=$connect->query($sqlConfirm);

if($rs === false) {
    trigger_error('Wrong SQL: ' . $sqlConfirm . ' Error: ' . $connect->error, E_USER_ERROR);
} else {
    $rows_returned = $rs->num_rows;
}